1885- Pyrite discovered by a group of prospectors on Mile Lake MountainMile Lake Mountain was first discovered by a group of gold prospectors near the shoreline of Mile Lake in 1885. Some minor explorations in this area had revealed that this site had contained a pyrite deposit zone. It was shortly after abandoned, and wouldn't be further prospected, and explored till World War 1 had settled in. The property at this time was rather known as the Caldwell Pyrite Property, which was situated on lots 1 and 2, within the fifth concession of Blithfield Township, Renfrew County, Ontario, Canada.

1915- Staked by T.B CaldwellBy 1915, the Caldwell Pyrite Property was officially being developed and place in production by T.B. Caldwell of Lenark, Ontario, Canada. Exploratory work on this site had rather commenced in the spring months of 1915, which resulted in the sinking of an incline shaft to a depth of 60 feet on the vein. Further examinations within the underground works had determined that the walls were well defined. There was also good ore for a distance of 8 feet from the foot to the hanging walls of this iron pyrite discovery. Much of this was determined after the company had made a shaft that was 12 feet in width to further prospect this vein material. In addition to this development, it was also stated that a short siding was built four miles north of Flower Station on the K & P Railway line. For the most part it was rather stated that this siding was used as a shipping point prior to making the road way into this property. Power at the time was mainly taken from a small plant that consisted of an 18 H.P. Upright Boiler, one single drum hoist, and a Guyed Derrick. Additional prospecting, and explorations had revealed the are to hold several outcrops on the strike of the main vein zone. In order to further prospect this property the prospector had additionally made preportions to cut a station on 70 foot level. Once this becomes completed he also insisted on continuing the underground workings by drift sections to the east, and west. Prior to development, Mr. T.B. Caldwell had also shipped 2 cars full of ore in order to test the deposit within the shallow depths of this project.

1916 - T.B Caldwell Continuous development was rather escalating in 1916, when Mr. Caldwell had sunk the No. 2 Incline shaft to 95 feet. This development had resulted in opening up a level which was drifted on for a distance of 35 feet on the vien. For the most part this resulted in a shipment of 10 cars of ore that were delivered to the Nicolas Chemical Company, Sulphide. At the time it was rather stated that all shipments in 1916 were made from a siding known as Clyde Lake Siding on the C.P Railway Line.

1917 - T.B Caldwell - Option property to Grasselli Chemical CompanyThe No. 2 shaft was continued to another 5 feet when it now had reach a depth of 100 feet below the surface. This resulted in cutting, and stationing a level on this section when it became opened up by 250 feet of drifting, and crosscutting. It more so during October, 1917, when the Caldwell Iron Pyrite Property was optioned to the Grasselli Chemical Company. Much of this option became exceeded and the property was later explored during the winter and spring months of 1917-18. Further explorations on this property became contracted to the Sullivan Company, which resulted in diamond drilling for a length of 2,300 feet. More construction would also occur when a new road way was being built from Clyde Lake Siding to the Mine Site. For the most part this became achieved because extensive preporations were being made to develop this Iron Pyrite deposit.

1918 - Grasselli Chemical Company, Limited acquired the propertyBy 1918, the property was fully acquired by the Grasselli Chemical Company who had purchase this property from T.B. Caldwell. In addition to this purchase, the property had included a 60 degree inclined shaft, and the No. 2 Shaft operation. By this time the Grasselli Chemical Company had also started to extend the workings in the No. 1 shaft. Much of this development was mainly escalating on the 75 foot level in order to connect the two shaft operations together. For the most part this resulted in developing a drift that was 400 feet long by April, 1919. Other preporations were being made in order to make the No. 2 shaft the main shaft. This had rather resulted in a sinking phase when the No. 2 shaft became sunk on 56 degree angle to a depth of 105 feet.

Other major construction within 1918 had resulted in the development of an ore bin, boiler, and compressor building, and dry and warehouse building. Much of the power was taken from a plant that had consisted of a 100 H.P. Horizontal Tubular Boiler, a 15 H.P. Vertical boiler, and hoist, and a 465 cubic foot Fairhurst Compressor.

1919 - Grasselli Chemical Company, Limited For the most part the underground workings during 1919, had consisted of two shafts, the old one being 75 feet deep, and the new one being 234 feet deep. Much of the development had officially connected the No. 1 and 2 shafts by a drift that was 460 feet in length. Development on the first level resulted in expanding the drift section for a length of 120 feet, which also resulted in the development of a 50 foot crosscut. There was also two raises that became driven to height of 22 feet which connected with each other.Most of the ore which became shipped during this time period had totaled 400 tonnes that was taken from development. Far more constructing had also occurred when a loading pocket was engineered on the 135 foot level During this time period the company would also timber its shaft that was also equipped with tracks, and a man-way. Prior to this development it was also during this time period when a new shaft house was erected, and a headframe was place.

Much of this development was also be followed by the construction of a new power plant that replace the old one. With this installation complete the company would also add the much needed mining equipment to operate this power plant.This whole entire power plant had consisted of two 200 H.P Goldie McCullough Boilers, one steam driven compressor of 450 cubic foot per a minute, one Marsh Engineering Company Hoist, and a Bowden 100 gal. pump. Far more installations would also occur when the company had installed a 36 inch gauge which connected the mine with the railway, at a distance of 8,500 feet. With this installation taking place the company had also poured the foundation for the concentrator plant.

Other company statements had stated that much of the ore that became hoisted from this operation had been dumped on a grizzly. Much of coarse product was also known to have went through an 18 inch Wabi Jaw Crusher, and makes its way to the 75 ton storage bin. After being place within the storage bin much of the concentrate was then elevated, and dumped into another grizzly. It was here when the fine product had passed through a pair of 14 by 36 inch Wabi Cornish Rolls, with the coarse material going through the picking tables before making its way to the Cornish Rolls. Once the ore goes through the Cornish Rolls its than once again elevated by a 14 inch belt bucket elevator to a trommel of 1/4 inch mesh, More so the oversized material then had went through another process as it went through the 18 inch Wabi Cornish Rolls. After this becomes complete much of the fine product was once again elevated to a 7- Cell Hartz Jig. For the most part the tailings that came with this process were stated to have been elevated and discharge into the tailings pile, with the ore going into cars for shipment.

Engineering preparations had also planned for this plant to process a total of 100 tonnes of ore per a day. Prior to this development the company had also stated that it would be powered by two fuel oil engines, one being 75 H.P. and the other one being a 35 H.P. With these installations taking place the company had also added a 15 K.W 250 Volt Generator which would also be powered by 35 H.P. engine. For the most part this installation would allow the company generate the much needed power source for lighting, and for the new pump which was place at the lake. Much of the Pyrite Concentrate was also reported to have been shipped to a plant in Hamilton which was owned by the Nicolas Chemical Company. No other development was under taken prior to the company ceasing mining operations. Besides mining operations becoming suspended, it was rather stated that the shipment of pyrite concentrate had continued till 1928. The Caldwell Property had went through another ownership change when the Nicolas Chemical Company had acquired this property, and continued milling operations for a short time period.